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A new cell line designated FRM was established from pleural effusion of a 13-year-old female cat with mammary adenocarcinoma. The cell line exhibited irregular round and polygonal shaped epithelial cells and demonstrated cell growth in a monolayer fashion with a doubling time of 22.4 hr. It possessed a modal chromosome number of 79. The immortality of this cell line was demonstrated using the TRAP assay which revealed a high telomeric activity of these cells. Scatchard analysis revealed quite low levels of estrogen receptors in both tumor mass produced in nude mice and FRM cells. Subcutaneous transplantation of the cells produced localized palpable masses in athymic nude mice within two weeks. This cell line may provide a good model for in vivo and in vitro studies on feline mammary tumors.

Establishment and Characterization of a New Cell Line Derived from Feline Mammary Tumor.